• WordNet 3.6
    • adj mephistophelian showing the cunning or ingenuity or wickedness typical of a devil "devilish schemes","the cold calculation and diabolic art of some statesmen","the diabolical expression on his face","a mephistophelian glint in his eye"
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Webster's Revised Unabridged Dictionary
    • prop. a Mephistophelian Pertaining to, or resembling, the devil Mephistopheles, “a crafty, scoffing, relentless fiend;” devilish in character or aspect; crafty; showing cunning or ingenuity or wickedness; as, a mephistophelean glint in his eye.
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Century Dictionary and Cyclopedia
    • mephistophelian Of, pertaining to, or resembling in character the spirit Mephistopheles; diabolical; sardonic; jeering; irreverent.
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In literature:

Hare, with his queer, Mephistophelian countenance, was the wickeder of the two.
"A Book of Remarkable Criminals" by H. B. Irving
Now don't smile that Mephistophelian smile at me.
"Dawn O'Hara, The Girl Who Laughed" by Edna Ferber
She had, as if designedly to relieve these effects, a pair of Mephistophelian black eyebrows and a very neat black dress.
"The Club of Queer Trades" by G. K. Chesterton
He avoided with difficulty a burst of Mephistophelian laughter.
"Under Western Eyes" by Joseph Conrad
At the elfin black hair and Mephistophelian face of this horrible, wonderful image, I stared fascinatedly.
"Tales of Chinatown" by Sax Rohmer
The face was almost mephistophelian in effect.
"The Master of Silence" by Irving Bacheller
For not even here was my father's satire of the cheerless and Mephistophelian school.
"The Caxtons, Complete" by Edward Bulwer-Lytton
It appeared to him a Mephistophelian ingenuity.
"Helen with the High Hand (2nd ed.)" by Arnold Bennett
Alfoxden was a slight, Mephistophelian man ... with bushy, red eyebrows.
"Tramping on Life" by Harry Kemp
The face was made Mephistophelian, and the front half of him wore scarlet.
"The Grey Wig: Stories and Novelettes" by Israel Zangwill